Abstract
Three-dimensional nanowires-based TiO2 hierarchical spheres (TiO2-HS) have been fabricated by a simple hydrothermal method in this paper. These TiO2-HS composed of the aggregations of TiO2 nanowires with countless porous holes show good electronic transfer, high loading of quantum dots and high diffused reflection ability. These TiO2-HS were designed as the overlayer for light blocking and applied to quantum dots sensitized solar cells (QDSSCs) based on bare TiO2 nanoparticles (TiO2-NP). CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction method. The results show that the values of the short-circuit current density (J sc) and the power conversion efficiency (η) have been increased up to 16.81 mA cm−2 and 4.50 % for the TiO2-NP/TiO2-HS double-layered QDSSCs, far higher than the single-layer TiO2-NP QDSSCs and TiO2-HS QDSSCs.
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